Hye guys i just ran my truck at the track for first time last night and im disapointed.

Truck Specs:
2007 RCSB 4.8
Trick kit Hot side w/ 76mm On3 turbo w/.96
Stock pump + Walbro on hobbs (4psi)
4L60e with TrailBlazer Stall - 3.73 gears

92 pump gas
TR6 @ .026 gap
11º / 12º Timing in Wot
AFR around 10.7 (still runing rich)
12 psi

Took it to the track, and ran a 14.29
(Sorry, our track has no 60ft, or Speed)

Bumped up the boost to 14psi, and ran 14.40 misfiring.

Tuning is being done by BlackBear, as i have minimal knowledge, and there are NO tuners in my area, i live in Merida, Yuctan, MEXICO.

before this last tune update, the truck was sputtering, popping, etc. and timing was at 8º / 8.5º, AFR practically the same, maybe a tad richer, and also 12 psi.. I ran against a friends C5 corvette and won... last night i raced against him, and i lost. eventhough timing is a better now, and popping/sputtering is very minimal now.

I am planing on adding a 4L80 and a 3000 Stall, but im still saving up.


Help me here! what could be my problem? why is the truck this slow?

thanks!

 

Mail order tune...

 

I agree theres nothing better than an in person dyno tune.. but sadly thats not possible..
Tuning is done via AutoCal...

I also noticed that 3rd gear, the truck just dies

 

Looks like you may have to purchase software to get a log of what is going on. That way he can get the tune way closer. Good luck to you!

 

I DO send him logs, with this last tune truck FELT like it was going a bit harder, and stopped stuttering, but apparently its slower than before.. I was expecting low 13s from it

 

Might haft to make a rd trip to Nelsons performance... Gotta pay to play.

 

I have to agree with Mudman...

 

Well taking a trip up there is practically impossible.. im 36 hours away from the border with the US, plus another 5 hours to San Antonio..

 

I agree, tune... You haven't given us enough information to suggest otherwise.

 

Are you sure you can't find a local tuner? I mean if there's a track there should be at least one guy who knows a thing or two.